class_docstr: Abstract agent class that can interact with a batch of envs.
code: def act(self, obs: Any) -> Any:
      return self.batch_act([obs])[0]
  
imports: import contextlib
  import os
  from abc import ABCMeta, abstractmethod, abstractproperty
  from typing import Any, List, Optional, Sequence, Tuple
  import torch
label_desc: Use image node_id 1 for calling the BatchAgent obj's underlying member method code with example usage: obj.act(obs) and returns: self